#31
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The concept I'm trying to get across is that any force applied to a material results in a deformation of that material, and that deformation is proportional to the force applied, and the modulus of elasticity of the material is the proportionality constant. All materials behave this way up to the elastic limit, which is the amount of force required for permanent deformation or failure. This is basic mechanics of materials for an engineer, and there's a language that engineers use to discuss these concepts. Stress is a force per unit area, strain is the deformation caused by the stress. It's difficult for me to discuss these concepts without resorting to engineerspeak. Sorry for the derail...
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Rodger Knox, PE 1917 Martin 0-28 1956 Gibson J-50 et al |
#32
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A good summary.
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#33
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Double action truss rods have 2 metal pieces that are solidly fastened at one end, and the other end can be adjusted to slip one metal piece against the other, to adjust the bow in either direction. There are many modern style double action truss rods that are quite compact and lightweight that out-perform the single action style in so many ways. You can even buy these on e-bay for about 6 or 7 bucks a piece, or you can buy USA made for 30 bucks to 50 bucks or more...
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---- Ned Milburn NSDCC Master Artisan Dartmouth, Nova Scotia |
#34
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#35
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My only experience with this was a couple of stunning acoustics on ebay, maybe 10 years ago.
They both were crazy gorgeous brw back and sides with what was possibly sitka tops. It was an estate sale, and the builder was unknown. And if I remember right, neither one got even $500. If I'd had the money I would have snapped both of them up.
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Something something, beer is good, and people are crazy. |